Steam set-works.



No. 694,780. Patentedv Mar. 4, |902.

l Application iled Oct. 17, 1900.)

4 Sheets--Sheet L (No Model.)

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No. 094,700. Patenten Mar. 4, 1902. c..s. PnEscoTT.

STEAM SET WORKS.

:Appliesian med oct. 17, 1900.)

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4 Sheets-Sheet 3.

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C. S. PRESCDTT.

STEAM SET WORKS.- Y

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Wl 1 l [fum/wor* ZMO Cczy Saz/"Z5 Hexali WwZ/M Ey M %%J@ UNITED STATES PATENT OEECEI CLAY SEARLE PRESCOTT, OF MENOMINEE, MICHIGAN, ASSIGN-OR OF ONE- HALF TO THE D. CLINT PRSCOTT A CORPORATION OF WISCONSIN.

STEAM SET-WORKS.

SPECIFICATION formingpart of Letters Patent No. 694,780, datedtMarch 4, 190.2.

Application led October 17, 1900. Serial No. 33,376. {No model.)

To all whom t may concern:

Be it known that, CLAY SEARLE Pans- COTT, a citizen of the United-States, and a resident of Menominee, county of Menominee, and State of Michigan, have invented certain new and useful Improvements in Steam Set- `tVorks, of which the following is a specification, and which are illustrated. in theaccompanying drawings, forming a part thereof.

The invention relates to that type of steam lset-Works in which the power for advancing the knees is derived from a reciprocating envation. Fi gs. 4,5, and 6 are details of the handlever for controllingthe valve of the motor. Figs.V 7, 8, and 9 are details of thevalve. Fig. 10 is a transverse vertical section' through the steam-chest and the valve, and Fig. 1l is a plan view of the steam-chest. A

The bed-plate of the motor is shown at 25 and is adapted to be bolted to the platform 26 of a sawmill-carriage and, supports acylinder 27, within which there reciprocates a piston 28, mounted upon a piston-rod 29, extending thronghboth heads of the cylinder and connected at both ends with an oblong rectangular frame 30, which incloses the cylinder. The side members of the frame 30 are formed into racks 31,.-which intermesh with segmental gears 32, xed upon the rockershaft 33, which is provided with the crankarms 34 35, carrying, respectively, the pawls 36 37 for driving the ratchet-wheel 38, mounted upon the setshaft-v 39, whereby the knees 40 arecaused to reciprocate.

A bifurcated stop-lever 41 is pi voted at the lowerendwof its` legs to upstanding anges of the bed-plate 25, as shown at 42, so that it straddles the cylinder 27. This stop-lever cooperates withstop-lugs 43, formed upon the side members of the frame 30, so as to positively limit the travel of this frame in one direction. 44, mounted at one end upon the cylinder 27 and at the other end upon a bracket 46, rising from the bed-.plate 25 and serving as well as a guide for the piston-'rod 29 and a positive stop therefor in one direction of its movement. Aspring-pawl 45, carried by the lever 4l, engages ratchet-teeth on the quad rant 44, so that the lever may be set in any desired position for the purpose of controlling the length of the stroke of the piston and its appurtenances. v

' A valve-chest 47 is mounted on top of the cylinder 27, and passages or ports 48 49 lead from its chamber through the cylinder-walls to opposite ends of the cylinder-chamber. The steam-chest is provided withpthe port 50 lfor the admission of steam and with an eX- haust-port 51, the latter leading from a passage 52, both ends lof which open to the charnber of the steam-chest a short distance from the ports 48 49. yA rocking or oscillating valve 53 is set withinthe steam-chest and is provided with a central radial cavity of sufficient width at one of its ends to include both 'of the ports 48 49, this cavity being in communication, by means of a port 55, with the steam-port 50. The valve is provided with a stem 54, by which it is manually controlled, and with peripheral exhaust-cavities 56 57. Laps 58 59 extend backwardly from the inner end of the central cavity of the valve partially across its peripheral exhaust-cavities, and lthese laps are provided with apertures, preferably a plurality of sets thereof, as shown at `60 6l, which may be brought into register with the ports 48 14S-for permitting the slow exhaust of the steam from the cylinder.

In yorder to regulate the exhaustand adapt it to the pressure of steam at which the particular engine is designed to be operated, means should be provided forredncing some or all of the apertures in the laps 58 59. Such means are shown in the drawings and conbers, as 63, 64, and 64a, the member 64 beingv ixed to the valve-stem 54 so that it may sweep a suitably-supported quadrant 65, and the intermediate member 64 connecting it with the grip member 63.

In order to limit the movement of the valve, stop-pins 66 67 are set in the quadrant 65 so as to cross the path of the member 64 of the hand-lever. Forthe purpose of adj ustably limitingl the throwof the valve in order that one ormore of its exhaust-apertures may come into register with the ports 48 49 a U- shaped plate 68 is mounted upon the lever member64 so as to contact with the pins 66 67, this plate being vmovable to permit the valve to travel still farther until the lever 'member 64 itself comes into contact with the stop-pin. For the purpose of controlling the adj usting-plate 68 the latter is provided with a stem 69, .Working through a guide-loop 70, fixed to the member 64a, and carrying a spring 71, reacting vbetween the guide-loop 70 and the back of the plate 68, so as to normally hold the latter in its advanced position. A`

stop 7 O? is also provided for limiting the-backward movement of the plate 68. The stem 69 is connected, by means of a link, with a bell-crank 72, pivotally attached to the handlever, and connected, by means'of a link 73, with a handpiece 74 at the upper end of the grip member 63, so that as the operator throws the valve he may, if he desires, withdraw the adj ustin g-plate 68 to permit the full throw of the valve, but by leaving this platein its normal position may have a positive stop for the valve in its limited range of movement.

When the machine is in use, the piston 28 is normally at one end of the cylinder 27 and is rmly held there by constant steam-pressure, the valve 53 being in the position shown in Fig. 2. In order to advance the knees, the valve-controlling lever is thrown forward to bring the central cavity of the valve into register with the steam-passage 49, the lap 58 of the valve being thrown across the passage 48 and the exhaust-cavity 56 of the valve being open to the exhaust-passage 52. The piston is moved to the opposite end of the cylinder, but withl a retarded speed, by reason of the slow exhaust of the steam in front of it through the aperture 60. or and 61. As soon as the piston has reached the farther end of the cylinder or been stopped by contactof the lugs 43 with the legs of the lever 41 the hand-lever is thrown backwardly to bring the valve to the position shown in Fig. 2, and the Vusual manner. y p

If a small log is upon the carriage, a

piston is thereby moved to its initial position. M

stronger cushioning action will be necessary than if aheavy log is mounted thereon, and this is controlled bymeans of the adjustingplate 68 according to the judgment of the operator. It is obvious that this adjustingplate may be dispensed with, so that the op# erator will depend upon his own skill in throwing the valve to the desired position, thereby making it possible to secure a still ner adjustment of the cushioning action. If desired, the operator may leave the valve normally in the position shown in Fig. 10, so that steam will be admittedto bothends of the cylinder. Inv order to properly balance the valve, its central cavity is extended entirely across it, and ports, aslindicated at 75,

may lead from its central cavity through the end of'the valve opposite the port 51. E y

By using a piston rod i which extends through both heads of the cylinder I not only equalize the face area of both sides of the piston, but I am able to render the entire'device exceedingly compact and simple. p

The central -valve -cavityis of 4sufficient width to span both of the cylinder-ports, so

that when'the valve is brought to a central position steam is admitted to'bothsides of the piston.

While I have shown and described an oscillating valve', Ido not desire to be limited to this form.

I claim as my invention- 1. In combination -with log-moving mechanism for a sawmill-carriage, a fluid=motor for actuating suchmechanism, ports for service and exhaust,`means movable to control said ports uniformly for service and variably for exhaust, and-means for controlling the motor, such means opening the service-ports uniformly and the exhaust-ports variably.

2. In combination with log-moving mechanism fora sawmill-carriage, auid-motor for actuating such mechanism, and means for con'- trolling the supply and exhaust of fluid, the formerIuniformly, and the operation of which to open the exhaust variably controls such exhaust, such mea-ns opening the serviceports uniformly and the exhaust-ports variably.

3. In combination with log-moving mechanism for a sawmill-carriage, a fluid-motor for actuatingsuch mechanism,and means for controlling the motor, such means opening the service-ports uniformly and the exhaust-ports variably in accordance with the position of the same.

4. In combination with log-moving mechanism for a sawmill-carriage, a fluid-motor for actuating such mechanism,and means for controlling the motor and providing an adequate Vpressure thereto and therefrom, and means acting with such controlling means for varying the exhaust', While the motor is in action.

7.. In combination,1mechanism for moving logs on a sawmillfcarriagq a reciprocating en- 25 a reciprocating,steam-engine having steampassagesleading to opposite vends ofits cylinfA gine for actuating such mechanism, a valve for suchengine having an induction-port ca-y.

pablo kof admitting steam to the full capacity` of the engine and having restricted and graduated exhaust-ports, and-adjustable means for limiting the throw ofthe valve.

8. In combinationwith a sawmill set-Works,

der, asteam-chest having induction andexhaust ports, a rockvalve within thechest and havin ga central cavity open to the inductionf port and adapted tocoxnrnunicate with V,the

Y cylinder-passages, and f having graduated ports adapted to connect the cylinder-pasf sages with the exhaust-ports of lthe chest, and adjustable positive stops forl limiting the throw of the valve. Y 9. In combination with the set-Works of a sawmill, asteam-cylinder, a piston reciproeating therein, a piston-rod xed to the piston and projecting through both heads of the cylinder, a yoke-shaped yframe inclosing the cylinder and attached to both ends of the pis-V ton-rod, stop-lugs formedr on the frame, an adjustable stop-lever crossing the path of the lugsfand means for operatively connecting such frame with the set-Works. 10. In combination witha sawmill set-Works, a reciprocating steam-engine having steampassages leading to opposite ends of itscylin-y der,"a steam-chest having induction and exhaust ports, a rockvalve Within the chest and having acentral cavity open to the inl duction -port and adapted vto communicate with the cylinder-passages and having graduated ports adapted to connect the cylinderpassages with the exhaust-ports of the chest,

a hand-,lever for movingthe valve, stops for y limiting the movementof the lever, a U-` shaped plate'iitting upon the lever for engaging such stops,- and Ymeans for withdrawing such plate.`

CLAY snARLE PRiisoo'r'r.v Witnesses: I i

Y J. C. ROSENBERG,

B. SHUTCHINSON. 

